D21 Hardbody 4WD V6-2960cc 3.0L SOHC MFI (VG30E) (1991)
Spark Plug: Testing and Inspection
Spark Plug Inspection
1.
Inspect the spark plugs for:
^
Improper gap
^
Carbon deposits
^
Cracked center electrode insulator
^
Burned or worn electrodes (may be caused by):
^ Excessive mileage
^ Lean fuel mixture
^ Advanced ignition timing
^ Loose spark plug
^ Plug heat range too high
^ Insufficient Cooling
^
Fouled plug (may be caused by):
^ Rich fuel mixture
^ Retarded ignition timing
^ Oil in combustion chamber
^ Incorrect spark plug gap
^ Plug heat range too low
^ Excessive idling/low speed running
^ Clogged air cleaner element
^ Deteriorated ignition coil, coil wire or ignition wires
2.
Replace the plug if the center electrode is rounded.
Standard Type
BKR6EY (NGK)
Hot Type
BKR5EY (NGK)
Cold Type
BKR7EY (NGK)
Spark Plug Gap
3.
Adjust the gap with a suitable gapping tool.
Electrode Gap:
0.031 - 0.035 in. (0.8 - 0.9 mm)